Method of manufacturing light emitting device

ABSTRACT

The present invention provides a manufacturing method of a light emitting device in which the number of display panels manufactured from one substrate is increased and display panel is mass produced is provided. One feature of the invention is that the shipping is performed not by separating the substrate over which a plurality of light emitting regions is formed and attaching the FPC to the each piece thereof but before separating, namely in the incomplete state (that can be also referred to as semi end products). However, the invention has a structure in which the inspection can be partly carried out before the shipping.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to a method for manufacturing a lightemitting device having a light emitting element over a substrate and amanufacturing system thereof. Specifically, the present inventionrelates to a method for manufacturing a light emitting device wherein alayer including an organic compound is to be a light emitting layer anda manufacturing system thereof.

2. Description of Related Art

In recent years, studies on a light emitting device having an EL elementas a luminous element have intensified. In particular, a light emittingdevice using an organic material as an EL material has attracted anattention. The light emitting device is referred to as an organic ELdisplay (OELD) or an organic light emitting diode (OLED).

Note that an EL element includes a layer containing an organic compoundin which luminescence (Electro Luminescence) generated by applying anelectric field is obtained (hereinafter, referred to as an EL layer), ananode, and a cathode. In luminescence emitted by an organic compound,there are fluorescence that generates when electrons return from aexcited singlet state to a ground state and phosphorescence that isemitted when electrons return from a triplet excited state to a groundstate. A light emitting device manufactured according to a depositiondevice and deposition method of the present invention is applicable toboth kinds of luminescence.

Further, there are two kinds for forming the light emitting device: amethod where an EL layer is formed between two kinds of stripedelectrodes provided so as to cross at right angles to one another (asimple matrix method), and a method where an EL layer is formed betweena pixel electrode which are connected to a TFT and arranged in matrixand a counter electrode.

An EL element has a structure in which an EL layer is sandwiched betweena pair of electrodes; generally, the EL layer has a laminated structure.Typically, the laminated structure, “a hole transporting layer/a lightemitting layer/an electron transporting layer” proposed by Tang et al.of Kodak Eastman Company is generally known. The structure has extremelyhigh luminous efficiency and is employed for almost all light emittingdevices that are under development now.

Further, a structure in which a hole injecting layer/a hole transportinglayer/a light emitting layer/an electron transporting layer arelaminated in order over an anode or a hole injecting layer/a holetransporting layer/a light emitting layer/an electron transportinglayer/an electron injecting layer are laminated in order over an anodeis also applicable. Fluorescent pigment and the like can be doped to thelight emitting layer. Such layers may be formed by entirely using a lowmolecular weight material or by partly using a high molecular weightmaterial to the part of the layers.

Further, a light emitting device has no viewing angle problems by virtueof its self-luminous property differently from a liquid display device.Thus the light emitting device is more suitable for using in the openair than the liquid crystal display device. Various types of usage ofthe light emitting device have been proposed.

In production lines of a liquid crystal display device, the size of asubstrate tends to become larger year by year in order to reduce theproduction costs. Further, the number of display panels (the number ofpanel faces) manufactured per substrate has been increased.

SUMMARY OF THE INVENTION

Problems to be Solved by the Invention

In production line of an active matrix type liquid crystal panelprovided with a pixel TFT in matrix over a substrate, an inspection iscarried out at the stage where a pixel electrode is formed, a capacitoris formed by utilizing the pixel electrode in non-contact, and thedefect of the pixel TFT is discriminated with the capacitor value.

Further, when a sampling inspection is carried out, the substrate whichis used for the sampling inspection does not become a panel for the lasttime. Therefore, in the case where the number of panels in one substrateis large, which results in extremely low yield.

Further, the defect of the pixel TFT can be discriminated by beingprovided with a circuit or a terminal for the inspection over the samesubstrate as the TFT, however, extra patterns increases and a complexcircuit configuration is made.

After carrying out the inspection, the liquid crystal panel is completedby sealing a counter substrate, injecting a liquid crystal, andattaching an FPC. The liquid crystal is shipped or continuouslyassembled, thus progressing to end products.

Further, a large quantity of the defective display panels that are to beeliminated are occurred in the case where all the inspections are notcarried out at all until the FPC is attached.

The manufacturing method described above is a method for manufacturing aliquid crystal display panel, and a manufacturing method of an activematrix type light emitting display device is not yet established.

In the liquid crystal display device, there is few problem when theinspection is carried out at the stage where the pixel electrode isformed since an orientation film is formed over the pixel electrode.However, in the active matrix type light emitting device, there is athreat of occurrence of the display defect only by adhesion of fine dustto the pixel electrode during the inspection when the inspection iscarried out at the stage where the pixel electrode is formed since alayer including an organic compound with ultra thin film thickness isformed over the pixel electrode. Further, sealing process is preferablyperformed as soon as possible since the layer including the organiccompound is vulnerable to oxygen and moisture.

Because the organic compound used for the light emitting element isquite expensive, and only one third to quarter or less of the whole ELmaterials put into a crucible at first are used in vapor deposition forforming a layer including an organic compound, a usage rate is extremelylow.

According to the invention, a manufacturing method of the display panelin which the number of display panels (the number of panel faces)manufactured from one substrate is increased, and which is provided witha light emitting element that mass produces the display panel in highyield (a layer including an organic compound is referred to as a lightemitting layer) is provided. According to the manufacturing method ofthe invention, a cost of end products is reduced.

Means for Solving the Problems

According to the invention, after manufacturing a TFT and a lightemitting element and carrying out sealing, the inspection of the TFT andthe light emitting element and then shipping thereof (or transporting tothe different place) are carried out. Thereafter a FPC is attached tothe TFT and the light emitting element after separating themrespectively at the shipped destination. Specifically, according to theinvention, the inspection is not carried out until sealing in order toprevent contamination of dust, so that the yield is improved. Note thatthe inspection (the light emitting inspection and drive inspection) isonly performed for a part of panels, and the panel without a defectafter the inspection is also assembled to the end products. For example,in the case where two-inch panels are arranged in 5 lines×8 columns,only one line (8 panels) are examined. In the inspection, one part ofthe sealing substrate is separated and the terminal portion of the FPCis exposed so as to have a contact with an electrode needle for theinspection or the FPC for the inspection. Further, since the terminalportion of the FPC which is to be attached later can be used as a padfor the inspection, the circuit and the terminal for the inspection arenot necessary. Namely, in the invention, after the inspection is done,it is possible to continuously assemble to be end products, therebyimproving the yield.

Further, on shipping, they are set to a carrier box provided with anantistatic material so as to have a contact with the terminal portion ofthe FPC used in the inspection has done. If the antistatic isinadequate, one part where the inspection is carried out in onesubstrate (the part where the FPC connection terminal is exposed) may bedestroyed. However, the light emitting region in the other part of onesubstrate is covered with the sealing substrate and protected.Consequently, the light emitting region is not shipped by separatingpiece by piece, but a plurality of light emitting regions is remainedintegrated when shipping, and then separated piecemeal at the shippeddestination. Accordingly, in the case where the light emitting region isin a small size, for example, the size where the display panel has a 2inches diagonal, the shipping is carried out conveniently. Then, afterthe light emitting regions are separated at the shipped destination, theFPC is attached thereto and the inspection is performed piece by piece.The qualitative product that passed the inspections is assembled to theend products, thereby completing the light emitting device.

One feature of the invention is that the shipping is performed not afterseparating the substrate over which a plurality of light emittingregions is formed and attaching the FPC to the each piece thereof butbefore separating, namely in the incomplete state (that can be alsoreferred to as a semi end products). However, the invention has astructure where the inspection can be partly carried out before theshipping.

A structure of the invention disclosed in this specification, as theexample thereof shown in FIG. 1, is a method for manufacturing a lightemitting device manufactured by zoning a substrate into a plurality ofblocks and by zoning each block into a plurality of light emittingregions, at the first place the method comprises: a first step offorming a plurality of light emitting regions and terminal portions overa first substrate; a second step of sealing the light emitting elementwith a second substrate; a third step of eliminating one part of thesecond substrate overlapped with one part of the terminal portion amonga plurality of terminal portions by separating, and exposing the onepart of the terminal portion; a fourth step of inspecting by applying acurrent only to the one part of the terminal portion; and a fifth stepof transporting from the first place to a second place, and at thesecond place the method comprises: a sixth step of separating the firstand the second substrates and dividing the each light emitting region; aseventh step of and attaching an FPC to a terminal portion connected toone light emitting region.

In addition, in the above structure, one feature of the invention isthat n×m(n>1, and m>1) light emitting regions are arranged in n linesand m columns on the substrate.

Further, another structure of the invention, as the example thereof isshown in FIGS. 2 and 3, is a method for manufacturing a light emittingdevice manufactured by zoning a substrate into a plurality of blocks andby zoning the each block into a plurality of light emitting regions, ata first place the method comprises: a first step of forming a lightemitting region and a terminal portion over a first substrate; a secondstep of sealing the light emitting element with a plurality of secondsubstrates; a third step of dividing the first substrate; a fourth stepof eliminating the one part of the second substrate overlapped with theone part of the terminal portion in a plurality of terminal portions bydividing, and exposing the one part of the terminal portion; a fifthstep of inspecting by applying a current only to the one part of theterminal portion; and a sixth step of transporting from a first place toa second place, and at the second place the method comprises: a seventhstep of separating the first and the second substrates and dividing theeach light emitting region; and an eighth step of attaching an FPC to aterminal portion connected to one light emitting region.

Further, according to the each structure described above, one feature ofthe invention is that the plurality of light emitting elements and theplurality of TFTs are provided for the light emitting region.

Further, according to each structure described above, one feature of theinvention is that the second substrate has the same size as that of thefirst substrate, or smaller size than that of the first substrate.

Further, in the present specification, the first place (or the secondplace) indicates a production factory or an industrial company. Althougheach of the first place and the second place is different in principle,it is not specifically limited as long as the distance thereof isstandoff. For example, each of the places may be different factory inthe same company, or the first place may be an associated company andthe second company may be a holding company.

Note that in this specification, all the layers provided between acathode and anode are collectively referred to as an EL layer.Therefore, the above mentioned hole injection layer, hole transportinglayer, light emitting layer, electron transporting layer and electroninjection layer are all included in the EL layer.

Further, in this specification, an EL element is a light emittingelement having a structure in which the layer including the EL materialand an organic material or an inorganic material (hereinafter referredto as an EL layer) for injecting a carrier to the EL material issandwiched between two electrodes (cathode and anode), and indicates adiode composed of an anode, a cathode and an EL layer.

Furthermore, the invention is not limited to an active matrix type lightemitting device as long as it is an light emitting device having a layerincluding the organic compound. The invention can be applied to apassive matrix type light emitting device which becomes a color displaypanel or an area color light emitting device which becomes a surfacelight source or a device for illuminations.

Effects of the Invention

According to the present invention, multi-panel forming can be performedwithout being provided with a circuit and a terminal for the inspection.Further, according to the present invention, the panels over which theinspection has done are also incorporated the end products, therefore,yield is improved and the panel can be efficiently manufactured.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a flow diagram which shows Embodiment Mode 1.

FIGS. 2A-2E are diagrams which show Embodiment Mode 2.

FIGS. 3A-3F are diagrams which show Embodiment Mode 2.

FIGS. 4A-4C are diagrams which show Embodiment Mode 3.

FIGS. 5A-5B are diagrams which show Embodiment 1.

FIGS. 6A-6H are diagrams which show Embodiment 2.

FIGS. 7A-7B are diagrams which show a light emitting device (Embodiment3).

FIGS. 8A-8B are diagrams which show a light emitting device (Embodiment3).

FIGS. 9A-9C are diagrams which explain a connection between a TFT and afirst electrode and a shape of a barrier (Embodiment 4).

FIGS. 10A-10E are diagrams which show an example of electric apparatuses(Embodiment 5).

FIGS. 11A-11C are diagrams which show an example of electric apparatuses(Embodiment 5).

FIGS. 12A-12B are diagrams which show a module (Embodiment 6).

FIG. 13 is a diagram which shows a block diagram (Embodiment 6).

EMBODIMENT MODES OF THE INVENTION

Embodiment mode of the invention is described below.

Embodiment Mode 1

An example of a flow of the present invention in which a panel ismanufactured with multi-panel forming is shown in FIG. 1.

The invention provides a method in which a light emitting device ismanufactured efficiently for a large size substrate having a size of,for example, such as 320 nm×400 nm, 370 nm×470 nm, 550 nm×650 nm, 600nm×720 nm, 680 nm×880 nm, 1000 nm×1200 nm, 1100 nm×1250 nm, and 1150nm×1300 nm.

First, a TFT is manufactured over the large sized substrate including aninsulating surface by using a known technique. Here, a substrate whereTFTs are arranged in matrix is referred to as an active matrixsubstrate.

In a process of manufacturing the TFT, a sampling inspection may becarried out conventionally. In the case where some sort of trouble isfound in this sampling inspection, massive occurrence of the defectsubstrates to be eliminated can be prevented by coping well with thetrouble, and itl results in preventing debasement of the end productsfrom occurring. The TFT (a p-channel type TFT or an n-channel type TFT)provided over a substrate is an element for controlling current whichflows in the EL layer emitting light, and another TFT (an n-channel typeTFT or a p-channel type TFT) or the plurality of TFTs is provided forone pixel. Further, a driver circuit composed of TFTs may be formed overthe same substrate.

Next, a film including an organic compound (hereinafter referred to as“organic compound layer”) between a pair of electrodes (cathode andanode) is provided to form a light emitting element in whichfluorescence or phosphorescence is obtained by applying an electricfield between the electrodes. Firstly, a first electrode which serves asan anode or a cathode is formed. Here, a transparent conductive filmwith a large work function (ITO (indium oxide tin oxide alloy), indiumoxide zinc oxide alloy (In₂O₃—ZnO) or the like), zinc oxide (ZnO) or thelike are used for the first electrode and an example functioned as ananode is described.

Further, in the case where a source electrode or drain electrode of theTFT is used as a first electrode without any change, or in the casewhere the first electrode is separately formed as to be in contact witha source region or a drain region, the TFT includes the first electrode.

Then, a wall (referred to as a bank, a barrier, an embankment, or thelike) is formed at the both ends of the first electrode (anode) tosurround a periphery of the first electrode. A curved surface having acurvature is to be at the top end portion and bottom end portion of thewall so as to obtain a preferable coverage. For example, in the casewhere positive type photosensitive acrylic is used as a material of thewall, the curved surface having a radius of curvature (0.2 μm to 3 μm)is preferably provided only for the top end portion of the wall. As thewall, either a negative type which is soluble in etchant byphotosensitive light or a positive type which is soluble in etchant bylight can be used.

Next, if it is necessary, the surface of the anode is rubbed and washedby using a porous sponge (typically, a sponge of PVA (polyvinyl alcohol)or nylon) soaked in a surfactant (weak alkaline). Immediately beforeforming a layer containing an organic compound, the substrate is heatedin a vacuum for removing absorbed moisture in the whole substrate thatis provided with the TFT and the wall. Moreover, the first electrode maybe exposed to UV radiation immediately before forming the layercontaining the organic compound.

Then, the layer containing the organic compound is selectively formedover the first electrode (anode) by vapor deposition method using anevaporation mask or ink jetting method. As the layer containing theorganic compound, a high molecular weight material, a low molecularweight material, an inorganic material, a mixed layer formed of theabove materials, a layer formed by dispersing above materials, or alamination layer appropriately combining such layers may be used.

Further, a second electrode (cathode) is formed over the layercontaining the organic compound. For forming the cathode, a materialhaving a small work function (Al, Ag, Li, Ca, or alloy of thesematerials such as MgAg, MgIn, AlLi, CaF₂, or CaN) is used. If necessary,a protective layer formed by covering the second electrode by sputteringor vapor deposition is formed. The protective layer may be formed of asilicon nitride film, silicon oxide film, a silicon nitride oxide film(SiNO film: a composition ratio of N to O is N>O)), a SiON film: acomposition ratio of N to O c is N<O), or a thin film containing carbonas its main component (for example, DLC film, or CN film), each of whichare obtained by sputtering or CVD.

Then, a sealing member is applied to a glass substrate that serves as asealing material in a desired pattern. Then, the sealing substrate overwhich a sealing member is drawn is bonded to an active matrix substrateso that the sealing pattern provided for the sealing substrate is sealedto encircle the light-emitting region provided for the active matrixsubstrate. The steps from the wall formation to the sealing arepreferably performed without being exposed to air in order to increasethe reliability of the panel.

Further, in order to conduct multi-panel forming, a plurality of lightemitting regions are provided for one substrate; therefore, the samenumber of display panels as that of the light emitting regions can beobtained in the end. Further, the sealing substrate may have the samesize as that of the active matrix substrate, or several pieces of thesealing substrate having smaller size than that of the active matrixsubstrate are attached.

Then, a scribe line for dividing the both substrates is drawn by using adiamond cutter or the like. A dummy pattern composed of the sealingmember is preferably formed in advance so that the segmentationperformed later becomes effective.

Next, the first segmentation is performed and only one part of thesealing substrate is separated. The part that is separated here is aportion overlapped with a terminal portion which is later attached to anFPC. However, the segmentation is not carried out to the entire lightemitting region respectively, but to the one part of the light emittingregion, for example, to the first line of the panels and keeps theterminal portion of the panels which locate behind the second lineoverlapped with the sealing substrate.

Next, the one part of the sealing substrate is removed, then theelectrode needle is brought into a contact with the exposed terminalportion or current is flowed to the light emitting region by temporallyattaching the FPC, thereby performing the light emitting inspection andthe drive inspection. One part of the light emitting region formed overthe substrate, for example, only one line of the panels is examined. Inthe substrate in which the result of the inspection was normal, the stepis kept without any change; on the contrary, in the substrate in whichthe defect is found, the substrate is destroyed or used as the failureanalysis.

Then, the substrate of which result of the inspection is normal isshipped or transported. In this step, transportation is convenientbecause the substrate is not separated to per panel piece by piece. Itis preferable that an electrostatic breakdown is not generated ontransportation, and it is desirable to protect the terminal portionwhich is inspected in a step before with an antistatic material and thelike. A material which can be easily removed is preferably used as theantistatic material.

Then, each substrate is divided at the destination where it has shippedor transported. It may be divided after performing scribe, or may bedivided in the scribe step immediately after attaching the sealsubstrate that is carried out in advance.

Next, the FPC is attached to the terminal portion respectively. Afterthe FPC is attached, the inspection (light emitting inspection and driveinspection) is carried out again. The inspection here is carried out onall the panel.

According to the above steps, a display panel connected with the FPC isformed, and then, end products can be completed by incorporating intothe electric apparatus appropriately.

According to the invention, multi-panel forming can be performed withoutproviding a circuit and terminal for the inspection. Further, yield isimproved since the panel with which the inspection is performed can beincorporated into the end products.

Embodiment Mode 2

Here, an example of preparing a plurality of pieces of sealingsubstrates having a size which is smaller than that of an active matrixsubstrate, and attaching to the active matrix substrate is shown.

For example, as an example is shown in FIG. 2(A), four sealingsubstrates which are slightly smaller than the active matrix substratemay be attached to an active matrix substrate 201. A plurality of lightemitting regions 202 each of which is surrounded by a sealing member(not shown) is formed over the active matrix substrate 201 and sealed bya sealing substrate 203. In FIG. 2(A), one active matrix substrate (600nm×720 nm) is divided into 4 pieces, each having 5 lines 8 columns (40panels), namely, total 160 panels (two inches diagonal) can bemanufactured from one substrate. Further, an example of arranging thepanels in matrix is shown here; however, a line which is to be examinedlater is not specifically limited as long as the position of theterminal portions are aligned, and a variety size of the panels can beprovided over one substrate.

First, the first segmentation where one active matrix substrate (600nm×720 nm) is divided into four pieces is carried out after the foursealing substrates are attached to the active matrix substrate. (FIG.2(A))

Next, the second segmentation where one part of the sealing substrateoverlapped with the terminal portion is separated is carried out (FIG.2(B)). FIG. 2(B) shows a top view of a piece which is obtained bydividing an active matrix substrate into 4 pieces, and a cross sectionalview thereof is shown in FIG. 2(C). In FIG. 2(C), reference numeral 204denotes a sealing member, reference numeral 205 denotes a terminalportion, reference numeral 206 denotes a piece which is cut, andreference numeral 207 denotes a dummy seal. The dummy seal 207 ispreferably provided so as to easily perform the second segmentation.

Then, only a part, for example, eight panels in the first line areexamined. FIG. 2(D) shows a top view of the panel state during theinspection. In performing the inspection, an electrode needle 208 forthe inspection is connected to the terminal portion as shown in FIG.2(E), and current is flowed by the inspection equipment (not shown)provided with a current source connected to the electrode needle.

Then, the terminal portions of the eight panels are covered with anantistatic agent 209, and shipped or transported. The top view thereofis shown in FIG. 3(A) and the cross sectional view thereof is shown inFIG. 3(B). As the antistatic agent 209, a conductive coating film, forexample, the film applied with a coating of surfactant, the film formedof a composition composed by dispersing an ionic conductive materialsuch as inorganic salt such as lithium chloride and magnesium chloride,polyelectrolyte containing carboxylic acid group or sulfonic acid groupinto a substance for forming the film such as synthetic resin andsilicate, or conductive polymer can be used.

Then, a third segmentation is performed so as to divide the panels pieceby piece. The top view is shown in FIG. 3(C), and the cross sectionalview is shown in FIG. 3(D). For the simplification, only four panels areshown in FIG. 3(C).

Lastly, the panel is completed by attaching an FPC 210 with the use ofan anisotropic conductive material so as to connect electrically withthe terminal portion. The top view is shown in FIG. 3(E), and the crosssectional view is shown in FIG. 3(F). For the simplification, only apanel is shown in FIG. 3(E).

Embodiment Mode 3

In Embodiment Mode 1 or Embodiment Mode 2, an example that a panel isprovided with an antistatic agent and then transported or shipped isshown. Here, an example in which an antistatic agent is provided for acarrier box of a substrate used in transporting or shipping is shown.

An oblique drawing of the carrier box is shown in FIG. 4(A) and the topview thereof is shown in FIG. 4(B). A gap is provided for a side wall401 of the carrier box, and an antistatic agent 402 is provided at theportion which has a contact with the terminal portion provided for anactive matrix substrate 400. The antistatic agent 402 also serves as acushioning material arranged in a contact area with the substrate andcarrier box.

In addition, a top cover may be provided for the carrier box shown inFIG. 4(A).

Electrostatic breakdown can be prevented by performing the shipment ortransporting with the use of the carrier box shown in FIG. 4(A), and thestep in Embodiment Mode 2 (formation of the antistatic agent or theremoval therefrom) can be reduced.

Further, the terminal portion provided on the active matrix substratemay be located in a bottom part of the carrier box. In this case, theantistatic agent is to be provided for the area connected with theterminal portion.

According to the carrier box shown in FIG. 4(A) and FIG. 4(C),transporting, holding and storing can be carried out without occurrenceof the electrostatic breakdown and breakage of the substrate.

This embodiment mode can be freely combined with Embodiment Mode 1 orEmbodiment Mode 2.

The present invention having the above structure will be described indetail in the following embodiments.

Embodiment 1

In this embodiment, FIG. 5 shows an example of manufacturing nine panelsin total obtained from a substrate (5 inches diagonal) cut by threelines and three columns.

First, a light emitting element comprising an anode, a cathode, and alayer including an organic compound sandwiched therebetween, and a TFTfor controlling current which flows to the light emitting element areprovided over a substrate having an insulating surface. A plurality oflight emitting elements is arranged in matrix so as to form a lightemitting region 502, and a plurality of the light emitting regions 502are provided. Further, terminal portions 505 a and 505 b for connectingwith an external circuit are formed at the same time as the TFT isformed. Here, a substrate provided with the plurality of light emittingregions 502 and the terminal portion thereover is referred to as anactive matrix substrate 501. For the last, one of the light emittingregions serves as one panel display region.

Further, a sealing substrate is attached with a sealing member providedin an outer periphery of the light emitting region 502 so as to surroundthe light emitting region 502 to seal the light emitting element. As thesealing substrate, a glass substrate or a plastic substrate in which asealing film is coated over the surface is used. A dummy seal may beformed in the periphery which serves as a parting line 503 to segmenteasily.

Since the light emitting element is specifically vulnerable to oxygenand moisture, it is preferable that the light emitting element is notexposed to air and the time from forming the light emitting element tosealing the sealing substrate is cut down as much as possible.

After sealing the sealing substrate, only a part of the sealingsubstrate is separated and is removed in order to carry out theinspection. In the step of the segmentation, the parting line is drawnwith a diamond cutter, and then pressure is put by a breaker, therebycutting the substrate along the parting line. In this embodiment, asshown in FIG. 5(A), a detached substrate 507 is separated, and theterminal portions 505 a of three panels are exposed. Note that anotherterminal portion 505 b is sandwiched between the sealing substrate andthe active matrix substrate.

Then, current is flowed from the exposed terminal portion 505 a, and thedrive condition and the light emitting condition thereof are examined.The inspection may be performed by connecting an electrode needle to theterminal portion 505 a or an FPC for the inspection may be attached witha bonding member that can be freely detached. In this embodiment, thereare three panels which are connected to the exposed terminal portions505 a, and only the three panels are examined. Since not all panels areexamined, the time and the trouble for the inspection can be reduced. Inaddition, there is no need to provide separately a circuit and aterminal for the inspection.

After the inspection, the panels with good quality is shipped ortransported. In this embodiment, nine panels in an integrated state areshipped. Due to the integration, transportation is convenient.Furthermore, the terminal portion 505 b is overlapped with the sealingsubstrate during transportation; therefore, dust and the like can beprevented from adhering.

Then, a plurality of panels as shown in FIG. 5(B) can be manufactured bysegmenting at the shipped destination and attaching an FPC 508 to eachof the panels. In this embodiment, nine panels including three panels inwhich the inspection is performed can be completed. Since the panel inwhich the inspection is performed serves as end products, yield can beimproved.

Lastly, the panel as shown in FIG. 5(B) is incorporated into an electricapparatus, and the electric apparatus can be completed.

In addition, this embodiment can be freely combined with any one of

Embodiment Modes 1 to 3 Embodiment 2

In this embodiment, FIG. 6 shows an example of manufacturing panels eachin a different size from one substrate. Further, in this embodiment, anexample in which a TFT is examined not by an inspection device providedwith an electrode needle as shown in Embodiment Mode 2 but by a deviceprovided with a current source by temporarily attaching an FPC.

In FIG. 6(A), two kinds of panels in a different size are manufactured.Fourteen panels in total, eight small size panels and six middle sizepanels are manufactured from a substrate. The panels to be examined arearranged in a line, and the direction of other panels not to be examinedis not specifically limited.

First, a light emitting regions 602 a and 602 b are formed over anactive matrix substrate 601 as Embodiment Mode 2, and sealed with asealing substrate 603 by using a sealing member 604. A top view at thisstep is shown in FIG. 6(A).

Next, a part of the sealing substrate 603 overlapped with a terminalportion 605 is removed as well as a part of an active matrix substrateto inspect over the light emitting region 602 a. A cross sectional viewthereof at this step is shown in FIG. 6(B).

Then, the light emitting region 602 a is examined. A top view at thisstep is shown in FIG. 6(C). FIG. 6(D) shows a cross sectional viewduring the inspection. The inspection is performed while a detachableconductive adhesive agent is attached thereto by using an FPC (an FPC610 for the inspection) and then, the FPC and the inspection device isconnected.

After the inspection, the panel with good quality is shipped aftertaking off the FPC for the inspection. In this embodiment, fourteenpanels are shipped in an integrated state.

Next, segmentation is performed at the shipped destination. The top viewat this point is shown in FIG. 6(E), and the cross sectional view atthis point is shown in FIG. 6(F). For the simplification, only fourpanels are shown in FIG. 6(E).

The FPC 611 is attached so that a plurality of panels in a differentsize as in FIG. 6(F) can be manufactured. Here, the cross sectional viewis shown in FIG. 6(H). In this embodiment, fourteen panels includingeight panels over which the inspection is carried out can be completed.Since the panels in which the inspection is performed also serves as endproducts, the yield can be improved.

Lastly, each of the panels is incorporated into the electric apparatus;therefore, the electric apparatus can be completed.

Further, this embodiment can be freely combined with any one ofEmbodiment Modes 1 to 3 and Embodiment 1.

Embodiment 3

In FIG. 7, an example of manufacturing a light emitting device (a topemission structure) provided over a substrate having an insulatingsurface with a light emitting element in which an organic compound layeris to be a light emitting layer is shown.

FIG. 7(A) is a top view of the light emitting device, while FIG. 7(B) isa cross-sectional view taken along a line A-A′ in FIG. 7(A). Referencenumeral 1101 indicated by a dotted line denotes a source signal linedriver circuit; reference numeral 1102 denotes a pixel portion; andreference numeral 1103 denotes a gate signal line driver circuit.Further, reference numeral 1104 denotes a transparent sealing substrate;reference numeral 1105 denotes a first sealing member; and an insidesurrounded by the first sealing member 1105 is filled with a transparentsecond sealing member 1107. The first sealing member 1105 contains a gapmaterial for securing a space between substrates.

Reference numeral 1108 denotes a wiring for transmitting a signal to beinputted to the source signal line driver circuit 1101 and the gatesignal line driver circuit 1103. The wiring 1108 receives a video signalor a clock signal from an FPC (flexible print circuit) 1109 whichbecomes an external input terminal. Although only the FPC is shown, aprinted wiring board (PWB) may be attached to the FPC.

Subsequently, a sectional structure is described with reference to FIG.7(B). A driver circuit and a pixel portion are formed over a substrate1110. Here, the source signal line driver circuit 1101 as the drivercircuit and the pixel portion 1102 are shown.

In the source signal line driver circuit 1101, a CMOS circuit in whichan n-channel type TFT 1123 and a p-channel type TFT 1124 are combined isformed. The TFT which constitutes the driver circuit may be formed of aCMOS circuit, a PMOS circuit or an NMOS circuit which are publicly knownin the art. In this embodiment, a driver-integrated type in which thedriver circuit is formed over the substrate is shown, but thedriver-integrated type is not necessarily applied. The driver circuitcan be also formed outside instead of being formed over the substrate. Astructure of the TFT using a polysilicon film as an active layer is notparticularly limited thereto, and either a top gate type TFT or a bottomgate type TFT is permissible.

The pixel portion 1102 is formed of a plurality of pixels comprising aswitching TFT 1111, a current controlling TFT 1112 and a first electrode(anode) 1113 which is electrically connected to the drain of thecurrent-controlling TFT 1112. The current-controlling TFT 1112 may beeither of an n-channel type TFT or a p-channel type TFT, but when it isto be connected to an anode, it is preferably the p-channel type TFT. Itis also preferable that a storage capacitor (not shown) is appropriatelyprovided. Here, only a cross sectional structure of one pixel in pixelsarranged innumerably is shown, and an example of using two TFTs in thepixel is shown, however, three or more TFTs may appropriately be usedper pixel.

Since it is constituted such that the first electrode 1113 is directlyconnected to the drain of the TFT, it is preferable that a lower layerof the first electrode 1113 be a material layer which is able to have anohmic contact with the drain comprising silicon, and an uppermost layerwhich has a contact with a layer containing an organic compound be amaterial layer which has a large work function. For example, by adoptinga three-layer structure comprising a titanium nitride film, a filmcontaining aluminum as a primary component, and a titanium nitride film,a resistance of wiring can be lowered; a favorable ohmic contact can beobtained, and which can function as an anode. Further, as the firstelectrode 1113, a monolayer of such as a titanium nitride film, achromium film, a tungsten film, a zinc film, a platinum film and thelike, or a laminate of three layers or more may be used.

Further, an insulator 1114 (referred to as a bank, a partition, abarrier, an embankment or the like) is formed at each end of the firstelectrode (anode) 1113. The insulator 1114 may be formed of either anorganic resin film or an insulating film comprising silicon. In thepresent embodiment, as for the insulator 1114, a positive typephotosensitive acrylic resin film is used for forming an insulator in ashape as shown in FIG. 7.

For the purpose of enhancing a coverage effect, a curved surface havinga curvature is to be formed in an upper end portion or a lower endportion of the insulator 1114. For example, when the positive typephotosensitive acrylic resin is used as a material for the insulator1114, it is preferable that a curved surface having a curvature radius(0.2 μm to 3 μm) is provided only to the upper end portion of theinsulator 1114. As for the insulator 1114, either one of a negative typewhich becomes insoluble to an etchant by photosensitive light, or apositive type which becomes soluble to the etchant by the light can beused.

Further, the insulator 1114 may be covered with a protective filmcomprising at least one film of an aluminum nitride film, an aluminumoxynitride film, a thin film containing carbon as a main component, anda silicon nitride film.

Further, a layer 1115 containing an organic compound is selectivelyformed over the first electrode (anode) 1113 by vapor deposition using avapor mask or inkjetting. Further, a second electrode (cathode) 1116 isformed over the layer 1115 containing the organic compound. As for thecathode, a material having a small work function (for example Al, Ag,Li, Ca, alloys of thereof, that is, MgAg, MgIn, AlLi, CaF₂, or CaN) maybe used. In the present embodiment, in order to allow luminescence topass through, as for the second electrode (cathode) 1116, a laminate ofa metal thin film which is made thin in thickness and one of atransparent conductive film (an indium oxide-tin oxide alloy (ITO), anindium oxide-zinc oxide alloy (In₂O₃—ZnO), and zinc oxide (ZnO)) isused. Then, a light emitting element 1118 comprising the first electrode(anode) 1113, the layer 1115 containing the organic compound, and thesecond electrode (cathode) 1116 is formed. In the present embodiment,the light emitting element 1118 is allowed to be an example of emittingwhite light, and therein, a color filter (for the purpose of simplicity,an overcoat layer is not shown here) comprising a colored layer 1131 anda light blocking layer (BM) is provided.

Further, when layers each containing an organic compound in which R, G,and B luminescence can be respectively obtained, are selectively formed,a full-color display can be obtained without using a color filter.

Further, a transparent protective layer 1117 is formed in order to seala light emitting element 1118. As the transparent protective layer 1117,the transparent protective laminate shown in Embodiment Mode 1 can beadopted. The transparent protective laminate comprises a laminatecomprising a first inorganic insulating film, a stress relaxing film anda second inorganic insulating film. As each of the first and secondinorganic insulating films, a film selected from a silicon nitride film,a silicon oxide film, a silicon oxynitride film (SiNO film (componentratio: N>O), or SiON film (component ratio: N<O)), and a thin filmcontaining carbon as a main component (for example, DLC film, or CNfilm) which are obtained by sputtering or CVD can be used. Theseinorganic insulating films each have a high blocking effect againstmoisture; however, as film thickness thereof is increased, a film stressis increased, then, they tend to be partially peeled or totally removedas a film. Nevertheless, stress can be relaxed and, also, moisture canbe absorbed by sandwiching the stress relaxing film between the firstinorganic insulating film and the second inorganic insulating film. Evenwhen a minute hole (pinhole or the like) is formed in the firstinorganic insulating film by an undefined reason, the minute hole can beblocked by the stress relaxing film and, further, by providing thesecond inorganic insulating film thereover, an extremely high blockingeffect against moisture or oxygen can be attained. As materials for thestress relaxing film, a material which has smaller stress than that ofan inorganic insulating films and has a hygroscopic property ispreferable. In addition to the above-described properties, a materialhaving a translucent property is desirable. Further, as the stressrelaxing film, a material film containing an organic compound such asα-NPD (4,4′-bis[N-(naphthyl)-N-phenyl-amino]biphenyl), BCP(bathocuproin), MTDATA(4,4′,4″-tris(N-3-methylphenyl-N-phenyl-amino)triphenylamine, and Alq₃(tris-8-quinolinolatealuminum complex) may be used. Each of thesematerial films has a hygroscopic property, and when they are thin inthickness, they become nearly transparent. Since MgO, SrO₂, and SrO eachhave a hygroscopic property and translucency, and also, a thin filmthereof can be obtained by vapor deposition, any one of these films canbe used as the stress relaxing film. In the present embodiment, asilicon target is used, a film formed in an atmosphere containing anitrogen gas and an argon gas, that is, a silicon nitride film having ahigh blocking effect against impurities such as moisture, and an alkalimetal is used as the first inorganic insulating film or the secondinorganic insulating film, and a thin film of Alq₃ formed by vapordeposition is used as the stress relaxing film. Further, in order toallow luminescence to penetrate the transparent protective laminate, itis preferable that an entire film thickness of the transparentprotective laminate is formed as thin as possible.

Further, in order to seal the light emitting element 1118, the sealingsubstrate 1104 is bonded thereto by using the first sealing material1105 and the second sealing material 1107 in an inert gas atmosphere. Asthe first sealing material 1105 and the second sealing material 1107, itis preferable that an epoxy resin is used. It is also preferable thatthe first sealing material and the second sealing material are each madeof a material which does not allow moisture or oxygen to penetratethereinto as much as possible.

Further, in the present embodiment, FRP (plastic substrate comprisingfiberglass-reinforced plastics), PVF (polyvinylfluoride), Mylar,polyester, an acrylic resin, and the like, other than a glass substrateor a quartz substrate can be used as a material which constitutes thesealing substrate 1104. After the sealing substrate 1104 is bonded byusing the first sealing material 1105 and the second sealing material1107, it is possible to perform sealing by using a third sealing membersuch that a side face (exposed face) is covered.

As described above, by sealing the light emitting element into thetransparent protective layer 1117, the first sealing member 1105, andthe second sealing member 1107, the light emitting element canthoroughly be shielded from outside. In consequence, substance such asmoisture and oxygen, which deteriorate the organic compound layer can beprevented from entering from outside. Accordingly, a light emittingdevice having high reliability can be obtained.

Further, as for the first electrode 1113, a both-side emission typelight emitting device can be manufactured by using a transparentconductive film.

Further, in the present embodiment, an example of a structure, in whicha layer containing an organic compound is formed over an anode and thena cathode which is a transparent electrode is formed over the layercontaining the organic compound (hereinafter, referred to as a topemission structure) is shown; however, a structure in which an organiccompound is formed over an anode, and a light emitting element in whicha cathode is formed over the organic compound, and then luminescencegenerated in a layer containing the organic compound is drawn to a TFTfrom the anode which is a transparent electrode (hereinafter, a bottomemission structure), may also be permissible.

An example of a light emitting device having the bottom emissionstructure is shown in FIG. 8.

FIG. 8(A) is a top view of the light emitting device, while FIG. 8(B) isa cross-sectional view taken along a line A-A′ in FIG. 8(A). Referencenumeral 1201 indicated by a dotted line denotes a source signal linedriver circuit; reference numeral 1202 denotes a pixel portion; andreference numeral 1203 denotes a gate signal line driver circuit.Further, reference numeral 1204 denotes a sealing substrate; referencenumeral 1205 denotes a sealing member in which a gap material forsecuring a sealed space is contained; and an inside surrounded by thesealing material 1205 is filled with an inert gas (typically, a nitrogengas). A trace of moisture in the inside space surrounded by the sealingmaterial 1205 is eliminated by a desiccant 1207 and, accordingly, thespace is sufficiently dry.

Reference numeral 1208 denotes a wiring for transmitting a signal to beinputted to the source signal line driver circuit 1201 and the gatesignal line driver circuit 1203. The wiring 1208 receives a video signalor a clock signal from a flexible print circuit (FPC) 1209 which becomesan external input terminal.

Subsequently, a sectional structure will be described with reference toFIG. 8(B). A driver circuit and a pixel portion are formed on asubstrate 1210, but the source signal line driver circuit 1201 as thedriver circuit and the pixel portion 1202 are shown here. In the sourcesignal line driver circuit 1201, a CMOS circuit in which an n-channeltype TFT 1223 and a p-channel type TFT 1224 are combined is formed.

Further, the pixel portion 1202 is formed by a plurality of pixelscomprising a switching TFT 1211, a current-controlling TFT 1212 and afirst electrode (anode) 1213 comprising a transparent conductive filmwhich is electrically connected to a drain of the current-controllingTFT 1212.

In the present embodiment, it is constituted such that the firstelectrode 1213 is formed so that a part thereof is overlapped with aconnecting electrode and the first electrode 1213 is electricallyconnected to a drain region of the TFT through the connecting electrode.It is preferable that the first electrode 1213 has transparency, and anelectrically conductive film having a large work function (for example,an ITO (indium oxide-tin oxide alloy), an indium oxide-zinc oxide alloy(In₂O₃—ZnO), or zinc oxide (ZnO)) is preferably used for the firstelectrode 1213.

Further, an insulator 1214 (referred to as a bank, a partition, abarrier, a embankment or the like) is formed over each end of the firstelectrode (anode) 1213. For the purpose of enhancing a coverage effect,a curved surface having a curvature is to be formed in an upper endportion or a lower end portion of the insulator 1214. Further, theinsulator 1214 may be covered with a protective film comprising analuminum nitride film, an aluminum oxynitride film, a thin filmcontaining carbon as a main component, or a silicon nitride film.

Further, a layer 1215 containing an organic compound is selectivelyformed over the first electrode (anode) 1213 by vapor deposition using avapor deposition mask or ink-jetting. Further, a second electrode(cathode) 1216 is formed over the layer 1215 containing the organiccompound. As the cathode, a material having a small work function (forexample Al, Ag, Li, Ca, alloys thereof, that is, MgAg, MgIn, AlLi, CaF₂,or CaN) may be used. Then, a light emitting element 1218 comprising thefirst electrode (anode) 1213, the layer 1215 containing the organiccompound, and the second electrode (cathode) 1216 is formed. The lightemitting element 1218 emits light in a direction of an arrow shown inFIG. 8. The light emitting element 1218 in the present embodiment is onetype of light emitting element which can obtain mono-color luminescenceof R, G or B. A full color can be acquired by three light emittingelements in which layers containing organic compounds wherein R, G, andB light emission can be respectively obtained is selectively formed.

Further, a protective layer 1217 is formed in order to seal the lightemitting element 1218.

Further, in order to seal the light emitting element 1218, the sealingsubstrate 1204 is stuck thereto by using the sealing material 1205 in aninert gas atmosphere. A concave portion has been previously formed overthe sealing substrate 1204 by sandblasting or the like and then, adesiccant 1207 is stuck to the thus-formed concave portion. As thesealing material 1205, it is preferable that an epoxy resin is used. Itis also preferable that the sealing material 1205 is composed of amaterial which does not penetrate moisture or oxygen as much aspossible.

Further, in this embodiment, as a material for constituting the sealingsubstrate 1204 having the concave portion, a plastic substratecomprising FRP (fiberglass-reinforced plastics), PVF (polyvinylfluoride), Mylar, polyester, an acrylic resin, or the like, other than ametal substrate, a glass substrate or a quartz substrate can be used.

Further, the present embodiment can be freely combined with any one ofEmbodiment Modes 1 to 3, Embodiment 1, and Embodiment 2.

Embodiment 4

In this embodiment, a cross sectional structure of one pixel,particularly states and manners of connections in regard to a lightemitting element and a TFT, and a shape of a wall provided betweenpixels is described.

In FIG. 9(A), reference numeral 40 denotes a substrate, 41 denotes awall (also referred to as an embankment), 42 denotes an insulating film,43 denotes a first electrode (anode), 44 denotes a layer containing anorganic compound, 45 denotes a second electrode (cathode), and 46denotes a TFT.

In the TFT 46, 46 a denotes a channel forming region, 46 b and 46 c eachdenote a source region or a drain region, 46 d denotes a gate electrode,46 e and 46 f each denote a source electrode or a drain electrode.Although a top-gate type TFT is described in this embodiment, the TFT isnot limited to a particular type, and a reverse stagger type TFT or aregular stagger type TFT is permissible. Further, 46 f denotes theelectrode which is connected with TFT 46 by allowing 46 f to be inpartial contact and overlapping with the first electrode 43.

Further, in FIG. 9(B), a cross sectional structure which is partiallydifferent from that shown in FIG. 9(A) is shown.

In FIG. 9(B), the overlapping manner between the first electrode and theelectrode is different from that as shown in FIG. 9(A); namely, thefirst electrode is patterned and, then, the electrode is formed suchthat it is partially overlapped with the thus-patterned first electrode,thereby connecting with the TFT.

Further, in FIG. 9(C), a cross sectional structure which is partiallydifferent from that shown in FIG. 9(A) is shown.

In FIG. 9(C), an additional interlayer insulating layer is furtherprovided, and the first electrode is connected with the electrode of theTFT through a contact hole.

Further, a cross sectional shape of the wall 41 may be a tapered shapeas shown in FIG. 9(D). Such shape can be obtained by exposing a resistto light by using a photolithography method and, then, etching anon-photosensitive organic resin or an inorganic insulating film.

Still further, when a positive-type photosensitive organic resin isused, as shown in FIG. 9(E), a shape having a curved surface on a topend thereof can be obtained.

On the contrary, when a negative-type photosensitive resin is used, ashape as shown in FIG. 9(F) having a curved surface on each of top andbottom ends thereof can be obtained.

Further, this embodiment can be freely combined with any one ofEmbodiment Modes 1 to 3 and Embodiments 1 to 3.

Embodiment 5

Various modules (active matrix type EL module, active matrix type ECmodule) can be completed according to the present invention. Thus, allelectronic apparatuses in which such modules are incorporated can becompleted.

Such electronic apparatuses are as follows: a video camera, a digitalcamera, a head mounted display (a goggle type display), a car navigationsystem, a projector, a car stereo, a personal computer, a portableinformation terminal (a mobile computer, a mobile phone or an electronicbooks etc.), and the like. Practical examples thereof are shown in FIGS.10 and 11.

FIG. 10(A) is a personal computer which includes a main body 2001, animage input portion 2002, a display portion 2003, a keyboard 2004 andthe like.

FIG. 10(B) is a video camera which includes a main body 2101, a displayportion 2102, a voice input portion 2103, operation switches 2104, abattery 2105, an image receiving portion 2106 and the like.

FIG. 10(C) is a game machine which includes a main body 2201, operationswitches 2204, a display portion 2205 and the like.

FIG. 10(D) is a player using a recording medium which records a program(hereinafter, referred to as a recording medium), including a main body2401, a display portion 2402, a speaker portion 2403, a recording medium2404, an operation switch-es 2405 and the like. In addition, the playerusing a DVD (Digital Versatile Disc), a CD or the like as a recordingmedium can be used for enjoying music, cinema, game, Internet or thelike.

FIG. 10(E) is a digital camera which includes a main body 2501, adisplay portion 2502, a view finder 2503, operation switches 2504, animage receiving portion (not shown in the drawing) and the like.

FIG. 11(A) is a mobile phone which includes a main body 2901, a voiceoutput portion 2902, a voice input portion 2903, a display portion 2904,operation switches 2905, an antenna 2906, an image input portion (CCD,image sensor, etc.) 2907 and the like.

FIG. 11(B) is a portable book (electronic book) which includes a mainbody 3001, display portions 3002 and 3003, a recording medium 3004,operation switches 3005, an antenna 3006 and the like.

FIG. 11(C) is a display unit which includes a main body 3101, asupporting portion 3102, a display portion 3103 and the like.

In addition, the display shown in FIG. 11(C) has a small, medium orlarge size display portion, for example a size of 5 to 20 inches.Further, in order to manufacture the display portion with such sizes, itis preferable to use a substrate with one meter on a side tomass-produce the display portions.

As described above, the applicable range of the present invention is sowide that the invention can be applied to manufacturing methods ofvarious fields of electronic apparatuses. Further the electronicapparatuses of this embodiment can be realized by utilizing anycombination of structures in Embodiment Modes 1 to 3 and Embodiments 1to 4.

Embodiment 6

The electronic apparatuses shown in Embodiment Mode 5 includes a panelin which a light emitting element is sealed, and wherein a moduleprovided with IC including a controller and a power source circuit aremounted. The module and the panel are both corresponding to one mode ofthe light emitting device, respectively. In the present invention, aspecific structure of the module will be described.

FIG. 12(A) shows an appearance of a module in which a panel 1800 isprovided with a controller 1801 and a power source circuit 1802. Thepanel 1800 is provided with a pixel portion 1803 in which a lightemitting element is provided for each pixel, a scanning line drivercircuit 1804 for selecting a pixel in the pixel portion 1803, and asignal line driver circuit 1805 for supplying a video signal to theselected pixel.

The controller 1801 and the power source circuit 1802 are provided for aprinted substrate 1806, various kinds of signals and power supplyvoltage outputted from the controller 1801 or the power source circuit1802 are supplied for the pixel portion 1803 through an FPC 1807, thescanning line driver circuit 1804, and the signal line driver circuit1805 in the panel 1800.

The power supply voltage and the various kinds of signals are suppliedto the printed circuit 1806 through an interface (I/F) 1808 in which aplurality of input terminals is arranged.

Although the printed substrate 1806 is mounted on the panel 1800 withthe FPC in this embodiment, the present invention is not limited to thisstructure. The controller 1801 and the power source circuit 1802 may beprovided directly on the panel 1800 with COG (Chip on Class) method.

Further, in the printed substrate 1806, due to a capacitor formedbetween leading wirings and a resistance of a wiring itself, a noise iscaused to a power supply voltage or a signal, or make a rise of a signaldull. Therefore, various kinds of elements such as a condenser and abuffer may be provided in order to prevent the noise from being causedto the power supply voltage or the signal and the dull rise of thesignal in the printed substrate 1806.

FIG. 12(B) is a block diagram showing a structure of the printedsubstrate 1806. Various kinds of signals and power supply voltagesupplied to the interface 1808 are supplied to the controller 1801 andthe power source circuit 1802.

The controller 1801 has an A/D converter 1809, a phase locked loop (PLL)1810, a control-signal generating portion 1811, and SRAM (Static RandomAccess Memory) 1812 and 1813. Although the SRAM is used in thisembodiment, instead of the SRAM, SDRAM can be used and DRAM (DynamicRandom Access Memory) can be also used if it is possible to write in andread out data at high speed.

Video signals supplied through the interface 1808 are subjected to aparallel-serial conversion in the A/D converter 1809 and inputted intothe control-signal generating portion 1811 as video signalscorresponding to respective colors of R, G, and B. Further, based onvarious kinds of signals through the interface 1808, Hsync signal, Vsyncsignal, clock signal CLK, and volts alternating current (AC cont) aregenerated in the A/D converter 1809 and inputted into the control signalgenerating portion 1811.

The phase-locked loop 1810 has a function to synchronize the phase ofthe frequency of each signal supplied through the interface 1808 withthe phase of the operating frequency of the control-signal generatingportion 1811. The operating frequency of the control-signal generatingportion 1811 is not necessarily the same as the frequency of each signalsupplied through the interface 1808, but the operating frequency of thecontrol-signal generating portion1811 and the frequency of each signalsupplied through the interface 1808 are adjusted in order to synchronizeone another in the phase-locked loop 1810.

The video signal inputted to the control-signal generating portion 1811is once written into and held on the SRAM 1812 and 1813. Thecontrol-signal generating portion 1811 reads out the video signalscorresponding to all the pixels, one bit by one bit, from among all thebits of video signals held on the SRAM 1812 and supplies them to thesource line driver circuit 1805 in the panel 1800.

Further, the control-signal generating portion 1811 supplies theinformation concerning a light emitting period in which the lightemitting element of each bit emit light to the scanning line drivercircuit 1804 in the panel 1800.

The power source circuit 1802 supplies a predetermined power supplyvoltage to the signal line driver circuit 1805, scanning-line drivercircuit 1804, and pixel portion 1803 in the panel 1800.

Explanation is now made on the structure of the power source circuit1802 in detail with reference to FIG. 13. The power source circuit 1802of this embodiment comprises a switching regulator 1854 using fourswitching regulator controls 1860 and a series regulator 1855.

Generally, the switching regulator is small in size and light in weightas compared to the series regulator and is able to raise voltage andinvert polarities in addition to reduce voltage. On the other hand, theseries regulator that is used only in voltage reduction has well outputvoltage accuracy as compared to the switching regulator, hardly causingripples or noises. The power source circuit 1802 of this embodiment modeuses a combination of the both.

The switching regulator 1854 shown in FIG. 13 has a switching regulatorcontrol (SWR) 1860, an attenuator (ATT) 1861, a transformer (T) 1862, aninductor (L) 1863, a reference power supply (Vref) 1864, an oscillatorcircuit (OSC) 1865, a diode 1866, a bipolar transistor 1867, a varistor1868 and a capacitor 1869.

By transforming a voltage of an external Li-ion battery (3.6 V) or thelike in the switching regulator 1854, a power supply voltage to besupplied to a cathode and a power supply voltage to be supplied to theswitching regulator 1854 are generated.

Further, the series regulator 1855 has a band-gap circuit (BG) 1870, anamplifier 1871, operational amplifiers 1872, a current source 1873, avaristor 1874 and a bipolar transistor 1875, and is supplied with apower supply voltage generated at the switching regulator 1854.

In the series regulator 1855, a power supply voltage generated by theswitching regulator 1854 is used to generate a direct current powersupply voltage to be supplied to a wiring (current supply line) forsupplying current to the anodes of various-color of light emittingdevices according to a constant voltage generated by the band-gapcircuit 1870.

Further, the current source 1873 is used for a drive method to writevideo signal current to a pixel. In this case, the current generated inthe current source 1873 is supplied to the source line driver circuit1805 in the panel 1800. In the case of a drive method to write the videosignal voltage to a pixel, the current source 1873 is not alwaysrequired.

Further, a switching regulator, an OSC, an amplifier and an operationamplifier are formed using a TFT.

Further, a structure of this embodiment may be freely combined with anyof the structures of Embodiment Modes 1 to 3 and Embodiments 1 to 5.

Embodiment 7

In this embodiment, an example of manufacturing a passive matrix typelight emitting device (also referred to as simple matrix type lightemitting device) is illustrated.

First, a plurality of first wirings are formed into striped form overthe substrate using a material such as ITO (a material to be an anode).Next, a bank formed of resist or photosensitive resin is formed so as toencircle a region to be a light emitting region. Then, a layercontaining an organic compound is formed in the region that is encircledwith the bank by vapor deposition or inkjetting. In the case ofachieving a full color display, a layer containing an organic compoundis formed by selecting appropriate materials. Striped plural secondwirings are formed of a metal material such as Al or an alloy of Al (amaterial to be a cathode) over the wall and the layer containing anorganic compound so as to intersect with the plural first wirings formedof ITO. According to the above-described steps, a light emitting elementusing a layer containing an organic compound as a light emitting layercan be manufactured.

Furthermore, the substrate is sealed with a sealing substrate by using asealing member, or sealed after forming a protective film over thesecond wirings.

As is the case with Embodiment mode 1, a plurality of light emittingregions is provided for one substrate. After sticking the sealingsubstrate. The one part of the sealing substrate is removed, and onlyone part thereof is examined (light emitting inspection).

Then, the one which proved to be good quality is shipped. And each ofwhich is divided in the shipped destination, thereby manufacturing aplurality of panels. According to the present invention, multi-panelforming can be performed without providing with a circuit and a terminalfor the inspection. Further, since the panels over which the inspectionhas done are also incorporated into the end products, yield is improvedand the panel can be efficiently manufactured.

Further, the present invention can be applied to not only a full colordisplay device, but also a mono color light emitting device, forexample, an electro spectacular and lighting for illumination.

Further, the present invention can be freely combined with any one ofEmbodiment Modes 1 to 3, Embodiment 1, Embodiment 2, and Embodiment 5.

1. A method for manufacturing a light emitting device by comprising thesteps of: forming a plurality of light emitting regions and terminalportions over a first substrate in a first place; sealing a lightemitting element with a second substrate in the first place; removingone part of the second substrate overlapped with one part of a pluralityof terminal portions by separating, and exposing the one part of theterminal portions in the first place; inspecting by applying a currentonly to the one part of the terminal portions in the first place;transporting from the first place to a second place, cutting off thefirst and the second substrates and dividing into each light emittingregion in the second place; and attaching an FPC to a terminal portionconnected to one light emitting region in the second place.
 2. A methodaccording to claim 1, wherein n x m (n >1 and m >1) light emittingregions are arranged in n lines and m columns in the first substrate. 3.A method for manufacturing a light emitting device comprising the stepsof: forming a plurality of light emitting regions and terminal portionsover a first substrate in a first place; sealing a light emittingelement with a second substrate in the first place; dividing the firstsubstrate in the first place; removing one part of the second substrateoverlapped with one part of a plurality of terminal portions byseparating, and exposing the one part of the terminal portions in thefirst place; inspecting by applying a current only to the one part ofthe terminal portions in the first place; transporting from the firstplace to a second place, cutting off the first and the second substratesand dividing into each light emitting region in the second place; andattaching an FPC to a terminal portion connected to one light emittingregion.
 4. A method according to claim 1, wherein a plurality of lightemitting elements and a plurality of TFTs are provided for the lightemitting region.
 5. A method according to claim 1, wherein the secondsubstrate has the same size as that of the first substrate or smallersize than that of the first substrate.
 6. A method according to claim 1,wherein the light emitting device is one of a video camera, digitalcamera, a display, a car navigation, a personal computer, and a personaldigital assistant.
 7. A method according to claim 3, wherein theplurality of light emitting elements and a plurality of TFTs areprovided for the light emitting region.
 8. The method according to claim3, wherein the second substrate has the same size as that of the firstsubstrate or smaller size than that of the first substrate.
 9. A methodaccording to claim 3, wherein the light emitting device is one of avideo camera, digital camera, a display, a car navigation, a personalcomputer, and a personal digital assistant.